Error: ga

## Error

```
ga
```

## Stack trace

```
/users/sign_in:415
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [Error: ga](https://thalamus-ai.sentry.io/issues/138685052/)
- **Culprit**: ?(users/sign_in)
- **First seen:** Aug 4, 2026

Start by inspecting the users/sign_in entry point at line 415 and review the linked Sentry report for the context around the "ga" error. Trace the failing sign-in path and determine the cause; done means the error is explained and the sign-in flow no longer produces it.

Written by the indexing model from the issue text.